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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6bbde04e9ed698d19e80c13653bcbcb6a4819f077564e3825387fba34e39c05' 
  AND token = 'mDhoYXTUeS3BYvSeLpDix7brQ/J3i2dmRFEXNo99FCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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