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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3125a5e33cc80fdf3164efd437be4a48d6344278e4993f0b049be330ba1c329c' 
  AND token = 'LTLr+j2nvCxZ4rF7SKmCtMi3zsGzdAHxn5cBPtGsY2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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