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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842b60b39af92e99dd164811fada42eab3febde725406627cac0586671f885d' 
  AND token = 'yJ/yxrR37OPJ/k9mJOzdBXAJZorzdn3BedC3r5GjF1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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