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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa28f4a3a9a97c7be6d300904562a05dd15f1c2ca2058859cd524accbde4a51' 
  AND token = 'WgzJE6N5B2fkxqoOwF61dkS43WWufu54pXk0LtG5TB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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