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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a522ef95e25b7ba688a6e54113047c0c0c47fad1563df077ced321a4538790a' 
  AND token = 'rn6BfNaI3kUcjxxXOQcTKa6Iu0Sx7GZcjfaEgIk7lz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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