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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddad634990edaed71e97a7959811703bf121aa06eb4294db3f8b6701b01fdfe7' 
  AND token = 'Wlf/02Jo0gBFQZLNSHqI4LFBHm1Pr+FT00uGcvpf8kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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