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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7545665aed5ed714bc4f6450c05f7bacf15f0755d68d51b48262a54dd311e0de' 
  AND token = 'uf0wdoQZyHPl8KeTcsGCa6gUvfl/etSnO5B5R4PU4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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