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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cb52d902a3a5196def206bcc5ffbe617cdf56ac9dc998bc701b3545117dd6c' 
  AND token = 'b0/Ognv9dyA2CW9ldQN/y4xXg/llLvxARS/UL1iiVtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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