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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b80a08440869823522c5064ea118edc7129831120ba3e6d42a9ec12c51405a' 
  AND token = 'YjQuhY8+r6g1bpfc/ytiey+dUu4kJs4HKq4AnpBd0W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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