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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1c0bc3d4372e1c49b1a40145f4d52a6bc17471c97dc6c983844f2a2293d9982' 
  AND token = '/m5+zcl20CXH9pyRG+977gk/KCpBSud/dxk15DC0/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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