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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcaee9ab862ab74ecc9678b3bcb22c40bf9dffa82c2c55daf268f8b9b04c180f' 
  AND token = 'aZOBLaSG7sCMyBXSJvqVMRSVaMsllFxgtqUnv1R+pR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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