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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6893ae13df95c143793eaf97f15eac480e2e4d75cda7af6c7b0d38afc9350a7d' 
  AND token = 'oK0ZlNpqx8e7GF9gEjjEk+6nPdmLHZiFVVRU5fhcArE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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