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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aac4e61d039393a510f449f88238dbd6bbfb8bd71fb9328cb95d35767b3e83a' 
  AND token = 'eIIR1kL2VMlkWsHVNS0R2b0wx+7/mfL9ea5x4TH9RJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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