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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996cf871fcd4d27498f0cd5f77c7a0378ffca96c1f23c09e5b4a0ad52caaae1f' 
  AND token = 'zPCfFmNqCmAzteD1pNhmZopGBqO7xQljhJSS2oZ8z0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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