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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790fc942e62656b3e40f9ffaa4cbfe4a8565901bf7acdf7f136142387e040e91' 
  AND token = 'R0YuNgs89MMU/GpKHq8ev3GO1iy6i3QxHRhM3MBvegk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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