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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a616c5364993c2b4209f86bc349b07d83efeb20f20e1ccc63548861e559c88' 
  AND token = 'sSD5pmWEj1YBY7PzuRppwKr8IVru0u0anqqoeo381sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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