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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33507eb93bcc984e42a4c19608a312d66dfa31e39fc28475377de8a085374a1d' 
  AND token = 'korRR1HNbcZrqZ4I5AKP1L+JHZLD8bhVKwddsFcwZTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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