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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1920120ac877f4cf8c9053d712f27634951c7e6876ad800e8d1fb2f7113e0a' 
  AND token = 'u71dus0zvwXvsV4h5L1897qMD82/2o3xrhE7gaXef+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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