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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4644ab8ee941e2b6b590d9dac62d7d935e3835b0ce5aceb56723b9500ce52678' 
  AND token = 'Nhyx+Qkz1iWxQ2sc2TeCQbx9g/aqiy84cDGN6QKNXDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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