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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b737b65c654d6f460a865706eae898c59017b34a850d2f01e5263dc48f2754' 
  AND token = 'b3ro0/s/FetKnEsrt3FdyElTL5/L2Yrw0PgKxHrLr4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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