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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807042387b76141cfe81a9c5bc0370232f5107f2ec4cfac0e24201cedd86b673' 
  AND token = '1Y4OVtPWE2QD4rltpWDOSMJO8lhARmuC6/uggivJlF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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