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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91995fecac16f831475243c46d36cc1f09a9bbcb2d1be409a1f3c3f5af7e92b4' 
  AND token = 'ucJq13tF9aRJ/tfuDfoPWS8D0mRIsR4RrTevWrCiiow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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