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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4601753cfdbc7460e5839729f5d28064cda2e20103432502c11080443c7f22e' 
  AND token = '3+K71498s8VQfnJ3V6Jct1fnpy5lwa3Rbb0DX4+yn9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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