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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd5b4eff7ca9d203a600c06a3f3ab51dd808157a831a0674f4bbaf1e1786418' 
  AND token = 'md9cPwCZ3hwezldTmvu+QCMzJdrKIXTO+X4L+j6bTmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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