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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67747ec3a2838ffffc062018cd4115c4073a09d9ab95a108845bbe70d33878eb' 
  AND token = 'o1eg6ZyHIgSM+27SO7WJItnEzf+3h6K7Mf7ACtgsTWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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