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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d6e7034e532d7c5e6ced699ff1b3443514cc1123c21ef878d05c5aaf9f0e02' 
  AND token = 'nQe/Y+BhZKeK66fkABPURMqk0hjTz5Y3mwPePvAkcFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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