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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817693da4364ddcb8d2036dea08a941d5531379704de1341ead153df40173027' 
  AND token = 'Wvw1olFHTY9Mva/3g6sDP2JY8aq79g+5lpZvU8x+QNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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