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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca6e3deb59689dd6fa31df31974dc283d8d21ad8e2184d034a1bf650fe2ecc54' 
  AND token = 'L+9uV8KlRBuUUDbMSaP89KjvL2/Po7uI/PN3SMkBaUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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