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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5355fa7c6161a78b06fdf9661cf3086a6ab2ba0102d16a1881d5581733808f' 
  AND token = 'EeNKBbrZ1+YubwmI/50jOLrbwnfqV+NsW7N+G2W15EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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