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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87baa2d88bcf77fb100b37bfc9201868f3ad4794599862f6b17938f04cfa159' 
  AND token = 'CHaBZ/lVVgDE6UkaNPcaMAKYIX2cB56dK4p9lOBsUOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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