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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861b423f86d05c77491317b1e94b8aa685cba035acc3a02e59825471c87720ba' 
  AND token = '3Q8Y77ctaN1tZ4V6ec4T8uPuJ/AS7AdA7lZ+yEqXPQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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