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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb37c2ae87143891e9e65fc59f15c7edeefc58c10122563a537be850bfab517' 
  AND token = 'vNvBUSjlMxRl90jyXJdR1e4ouQkO8EfaA8m06HLakJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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