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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ee6cfd1b62393e882320c18a4b861d6d39fdb15cde963d099f0a87a75a7b61' 
  AND token = '+pf78K8rPTZwgJWZxzcFydFsNCfW2WAGDf33czBUXbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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