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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4147161cf274c02e0a248eb91cd00ab35044e51e12efa4c6c77e47a1f2b2f0' 
  AND token = 'NhdlMps8IlyYaTpLNEf8Ugub4K5qa0ODZCj/kC0lfgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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