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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9494b91a943dbac43255bb53b257c620db83b410d9efa3a835ba929c0549a3' 
  AND token = 'T78R4jI2vFBJkYhY0K2Ho//9E3scrRj47SfK/1Peljg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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