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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c90ff16d93bd657adb846f38af7f1e1525ab661410bac20ef4a6c97dab4a1f' 
  AND token = 'FQxz8o7ONctE8oL83g8PJ8OjvVmRix063fnE8nMN/ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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