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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf25cf3ad89049fe5a59a52ccdfe161910374205ec8a007dc427dea469ec8c9' 
  AND token = 'w/N+D661lVkspMR8eP/+rtEGREohNbg1GovybY86uy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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