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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6334f24a4c2aba55a5a8571f841be35e6cddd62c769c0540e81a0b3c5d7bf0ce' 
  AND token = '4G32Y26HdkE63YE2TeOgvvOmScyBjaIv6FrinQpcBcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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