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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8788daecfa85942cedc552f138521c66d8e97604e536bb52eab860f87f8c8f8' 
  AND token = '8v+9Jobs10Z+eT0mttaIwXmnanMgf+c04JAC3D/fHVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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