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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2900333eac4b2672c22e26d329da404be1f2b972fc4bc511b9b3d117fa3472fb' 
  AND token = '/3yIX1Q0MmGfQJ0B5reiAidShCGxm46nGPXsiQgZwuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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