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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fd30765f1a49b1c2d5cdd18e68b8be18fbdfc625290f8df039200875d2afb4' 
  AND token = 'AdWStO2P0wRmAitJjy9PBlTIQHsaZce3ZJKefGSn/As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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