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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '182613747119025e0a99c4bb7f25350a4fcf8bc5f2f75ee2f3d52295f553c74e' 
  AND token = '25/5Ak/jwofZsercqRuxbLHR/Akg17+HL+5se2m/fDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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