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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c91cf938bf09838a86336a5608a363e7a9f089f89c7cb8f3e08680a1d6f98ad' 
  AND token = 'N9P9Lvosufzy920GkJ7awa2b0wlOJIyT0+h/pQHZX2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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