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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be20246dc0bccd0f9da74bf7e98f00fb6f989d6800ad6d779445b28177fddf3' 
  AND token = '1H6SFqA3WNsFs4cOfERphxqJ13lyt5vHiirIDechJ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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