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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697a5c031d41cd7cc33c0e8fbb1522e2525a80a3fa71253e34026038c6d6b443' 
  AND token = 'YRzSsnMfMzagT0VcEOHLMzF+MkckG1El7iXtxvo/05w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}