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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d5bf27717d393ab1af2db702d763e77b661dc9bca35bf425f06a6acfc98ee9' 
  AND token = 'Z6np1Ni/Pfs8ntz8NGmh7ZWDmfLC5sLIUObw3zFmeZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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