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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01b38abfdaea9e1252812d1108219e3fc3e3ffb3ab5f0529310217217224b52' 
  AND token = 'cL5nfkxoojby2vaJxFN8SQ4EIUXnl/ONcaRE61LNZN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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