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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af2e16f2ed54a42d131a406e0338102e86df662ebce604df3f5c7e47fae91b9' 
  AND token = 'igmOD+fHrFEs6Px0zjuK/c2exOc4ue6sJ7PYki5m12Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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