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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b264fd81a3407e2030d1662e5c3fafce42751d16b50eb5ba2dc5e91267a617f8' 
  AND token = 'sv/A3+8KPi7qqOcs6+wdz+IAInIstTLquKjbJ53G350=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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