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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cecaa4c0a99ce65bd95f2a4ea9126309d21400d61b28bf9a332d74a7b9a362' 
  AND token = 'K6Rf3b8aSszU7lPOO5z1tkFcMrXfiTaC0GP7sYf7n6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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