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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62373b7956518a6ed5dd5034aa2ab5c4f86c1dfd5ad55ce38072ae06f11551fd' 
  AND token = 'i3C+el9QmMtJ1+oTSva91Uq9c9o856PKQ9sMT3EGJJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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