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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e306aa390aa96e45863ac554354519dcbbeab7dafc825e37cff3583c3adb8f98' 
  AND token = '5m4bo2cEmxGBJK+v9rNELNcL7MFInq0vyyd8ma9cyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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