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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9b2f8bd4dd0596e18f31e3ea52a609c6fdfbc347095fb10698b9e46d0e410f' 
  AND token = 'LpH+ZMb0SBRv9X2DtZoqDxxaHONI5Mi4UQNMBYsR+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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