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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c1ba34729f8ff228a2eea852f2522a531ef9bff7bae35ddfb700f2c9532dc73' 
  AND token = '0T8n8nRbCozgo7wEs6vBi0nziipIRUXd7aI7naJ1B5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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