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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8a5f28cdf29861922425ba54a4ca51548978e7215244d6291a195c9bb1a7e4' 
  AND token = 'JWezln7lTznAs75p6Mk3bwDZN7o1EOEKO78OXnqzq2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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