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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b862f0c228c6f90c37d09b88ef6e791ffcdf2afbf543b9253201efe86a308fcc' 
  AND token = '8Ie+1d5XoF/hp9XWPFGXblQrugLwOTLUiFK6omK0veQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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