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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e4ed77588b3ceac8e99cd08b7d2759d0ec6139b75a84dfe94ba6236d94db90' 
  AND token = 'dPBz5OajIS6wPTSHmCPdw2qODGDdP4W0ISGE+W3EPMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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