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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610348b30fc13b3a7e124d5f102e3e7b7e07424d356dc526542b12b713fac9d1' 
  AND token = 'vGqbBFlVdDjIcCbq/L7ytkcJIuGJMpebW5klZrfcH/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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