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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc2fecc527dfa4324f63452cd14e142268b00a59dbec7b938f0b44c9e3708da' 
  AND token = 'cK/ERNsIpRku/broPG6768fq2ceeAf7ltf5h7ZIbe5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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