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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e608fe79c5e2940aeb0aeac3b0d4305e6e53454df06de9385d37e18e6aa93736' 
  AND token = 'BWNsaCkIAygm5E7otiZ9EPJxwfQHaaS86pv9dZMNFe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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