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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117928a0b8442cd4ddba02de04bf4f165c3c893403011a4f632404305e23b488' 
  AND token = 'm12XBWCpnxzzgJFPc0pxzKEXK54acP+unOY3F8H/mqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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